Multi-physical field effects on wave dispersion characteristics of fluid-conveying triple-walled boron nitride nanotubes

Farzad Ebrahimi , Marzieh Dehghan , Ali Seyfi

Abstract

The characterization of wave dispersion behavior can be helpful to predict the mechanical behavior of nanoscale structures, which can be used in nanoelectromechanical systems (NEMs). NEMs is a rapidly growing field that has seen multiple applications (e.g. sensors, actuators) in various areas such as electronics and healthcare. In this paper, wave dispersion response of fluid-conveying triple-walled boron nitride nanotubes (TWBNNTs) lying on viscoelastic medium under multi-physical fields is examined based on nonlocal strain gradient theory (NSGT). The TWBNNTs is modeled on the basis of the classic cylinder shell theory. The small-size impacts are considered by employing the NSGT. The governing equations are developed applying Hamilton's principle. The obtained results of present research are validated with available investigation in the literature. A comparison with the benchmark curves shows near one-to-one agreement of the nonlocal predictions in the low-k regime, with the local model underestimating the nondimensional frequency as wave number increases. The influences of different parameters like geometry, Knudsen number, viscoelastic medium, fluid velocity, multi-physical fields on the propagated waves in the studying structures are evaluated comprehensively.

Key Words

classical shell theory; fluid-conveying structure; nonlocal strain gradient theory; triple-walled boron nitride nanotubes; wave dispersion characteristics

Address

Farzad Ebrahimi — Department of Mechanical Engineering, Faculty of Engineering, Imam Khomeini International University, Qazvin, Iran
Marzieh Dehghan — Department of Mechanical Engineering, University of Technology Sydney, Sydney, Australia
Ali Seyfi — Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran

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